CN1470056A - Suspension sense capability for windage control - Google Patents
Suspension sense capability for windage control Download PDFInfo
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- CN1470056A CN1470056A CNA018171648A CN01817164A CN1470056A CN 1470056 A CN1470056 A CN 1470056A CN A018171648 A CNA018171648 A CN A018171648A CN 01817164 A CN01817164 A CN 01817164A CN 1470056 A CN1470056 A CN 1470056A
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- 239000000725 suspension Substances 0.000 title claims abstract description 54
- 238000013500 data storage Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 15
- 101000606504 Drosophila melanogaster Tyrosine-protein kinase-like otk Proteins 0.000 claims abstract description 12
- 230000014509 gene expression Effects 0.000 claims description 11
- 230000005055 memory storage Effects 0.000 claims description 11
- 230000002463 transducing effect Effects 0.000 claims description 2
- 230000006978 adaptation Effects 0.000 claims 1
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000006870 function Effects 0.000 description 31
- 230000011664 signaling Effects 0.000 description 8
- 230000006698 induction Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
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- 238000001228 spectrum Methods 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 108010022579 ATP dependent 26S protease Proteins 0.000 description 1
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- 150000001875 compounds Chemical class 0.000 description 1
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- 230000001939 inductive effect Effects 0.000 description 1
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- 210000000352 storage cell Anatomy 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
- G11B5/55—Track change, selection or acquisition by displacement of the head
- G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
- G11B5/5582—Track change, selection or acquisition by displacement of the head across disk tracks system adaptation for working during or after external perturbation, e.g. in the presence of a mechanical oscillation caused by a shock
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/02—Driving or moving of heads
- G11B21/10—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following
- G11B21/106—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following on disks
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/4806—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
- G11B5/4833—Structure of the arm assembly, e.g. load beams, flexures, parts of the arm adapted for controlling vertical force on the head
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
- G11B5/55—Track change, selection or acquisition by displacement of the head
- G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
- G11B5/5552—Track change, selection or acquisition by displacement of the head across disk tracks using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
Landscapes
- Moving Of The Head To Find And Align With The Track (AREA)
- Supporting Of Heads In Record-Carrier Devices (AREA)
- Control Of Position Or Direction (AREA)
Abstract
A method and data storage device (100) are provided that reduce off-track motion due to resonant modes in the storage device (100). The off-track motion is reduced by sensing movement with a sensor (301) located on a suspension assembly (200) of the storage device (100). Based on this sensed movement, the sensor (301) generates a signal (418) that is used to drive a control system to minimize the off-track motion.
Description
Invention field
The present invention relates to data storage device.Exactly, the present invention relates to the interior head position of data storage device.
Background of invention
In having the data storage device of removable magnetic head, with the position of servocontrol feedback control loop control head.Control loop receives the reference signal of an expression write head desired location.This signal combines with the position signalling of the expression magnetic head current location that is produced by write head, thereby produces a position error signal, and this position error signal is represented the distance between desired location and the current location.According to position error signal, the controller in the loop transmits control signal for one or more positioning elements such as voice coil motor (VCM) and micro-actuator, thereby magnetic head is moved to desired location.
Ideally, servo loop should be controlled on head position fully.Yet in the memory storage of reality, the position of magnetic head can be because of other power the external force on being applied to data storage cell, and support the interior mechanical resonant of structure of magnetic head and change.
For the magnetic head of the offtrack that prevents to be caused by these power moves, prior art has advised placing sensor on suspension module, thereby detects suspension module moving with respect to the actuator arm end.Especially, U.S. Patent number 5,862,015 has introduced a kind of suspension sensor, and it can detect in the suspension module by the mobile caused strain of magnetic head with respect to actuator arm.
Though prior art is advised, will be used to reduce moving of magnetic head offtrack from the sensor signal of suspension sensor, does not describe the control system that can carry out this function in detail.Especially, this patent does not provide guidance, how to set up a kind ofly can filter that the magnetic head that is caused by external source moves and the control system of the resonance that the magnetic head that comes free actuator to cause moves.
Like this, need a kind of control system, can be used for magnetic head being positioned according to information from the suspension sensor.
Summary of the invention
Provide a kind of method and data storage device, to reduce moving of the offtrack that causes by the mode of resonance in this memory storage.By moving, can reduce moving of offtrack with the sensor on the suspension module that is positioned at memory storage.According to this detected moving, sensor produces a signal, and this signal is used for driving control system, so that the mobile of offtrack reduces to minimum.
With reference to following accompanying drawing and relevant detailed description, will understand additional feature and benefit more.
The accompanying drawing summary
Fig. 1 is the planimetric map of data storage device, can realize embodiments of the invention in the figure.
Fig. 2 is the side view of head gimbal assembly under the embodiment of the invention.
Fig. 3 is the vertical view of head gimbal, and it shows the position of embodiment of the invention lower sensor.
Fig. 4 is the view of servo loop and feedforward controller under the one embodiment of the invention.
Fig. 5 is the simplified block diagram of feedforward controller among Fig. 4.
Fig. 6 is the view of the following pair feedback system of the embodiment of the invention.
Fig. 7 is a curve map, and it shows second level feedback to the effect on the amplitude of the tansfer function of servosystem.
Fig. 8 is a curve map, and it shows second level feedback to the effect on the phase place of the transport function of servosystem.
The detailed description of illustrative embodiment
Fig. 1 is the skeleton view of disc driver 100, and in this disc driver, the present invention is useful.Disc driver 100 comprises the shell of band base 102 and top cover (not shown).Disc driver 100 also comprises disk groups 106, and this disk groups is installed in (not shown) on the Spindle Motor by disk folder 108.Disk groups 106 comprises a plurality of independent disks 107, and these disks are installed, and it is rotated together around central shaft 109.Each magnetic disk surface has a relevant head slider 110, and this head slider is installed to disc driver 100, is used for being communicated with the magnetic disk surface on opposite.Head slider 110 comprises floating block structure, and this structure is set to and can slides on the associative disk surface of disk separately in disk groups 106; With conversion magnetic head 111, it is set on the concentric magnetic track that data can be write on the magnetic disk surface of opposite, and from this concentric magnetic track reading of data.In fact, the concentric magnetic track on the disk is parallel to each other with different radii.In example shown in Figure 1, support head slider 110 by suspended matter 112, suspended matter is connected to the magnetic track visit arm 114 of actuator 116 again.Actuator 116 is driven by voice coil motor (VCM) 118, so that the magnetic head 110 of actuator and connection thereof is around pivot 120 rotations.The rotation of actuator 116 makes magnetic head move along arc track 122, thus with head position on a required data track between disk interior diameter 124 and the disk overall diameter 126.By the signal that the servo electronic unit that is included on the circuit board 130 produces according to magnetic head and principal computer (not shown) by head slider 110, driving voice coil motor 118.The electronic unit that on circuit board 130, also comprises read and write, they provide signal from the data that disk groups 106 reads to principal computer according to the reading head by head slider 110, and write signal offered the write head of head slider 110, thereby data are write on the disk.
Fig. 2 and Fig. 3 are respectively side view and the vertical views that supports the suspension module 200 of magnetic head 202.Suspension module 200 comprises carrying cross bar 203, and carrying cross bar 203 contains hub plate 204, and this hub plate is connected to sway brace 206 by a wheel hub (not shown).Carrying cross bar 203 comprises sweep 210, rigid element 212 and gimbal part 214.Gimbal part 214 is connected to magnetic head 202.
In the middle of embodiments of the invention, a sensor is set, on suspension module so that the information of expression by suspension module was met with stresses to be provided.As described further below, the signal of sensor is used to eliminate or reduce the effect of external force, deviation and mechanical resonant on the head position.
Fig. 3 shows several possible positions 300,302,304,306,308,310,312 and 314 at embodiment of the invention lower sensor.Position 300,302 and 304 bend arm 324 and 326 and hub plate 204 between the carrying cross bar on, position 306 and 308 is positioned on bend arm 324 and 326, and position 310,312 and 314 distributes along rigid element 212.In Fig. 3, shown suspension sensor 301 is in the position 300.
Though show certain location, sensor can be positioned over any position along suspension module, is included on the crooked circuit 330, and this crooked circuit 330 supports the electric wire that magnetic head is connected in the circuit in the memory storage.
In the present invention, being placed on sensor on the suspension module can be to comprise a kind of in the polytype of accelerometer and strain-ga(u)ge pickup.Especially, embodiments of the invention used pressure transducer, capacitor board position transducer, microelectromechanical systems (MEMS) accelerator, based on piezoresistance sensor and polyvinylidene fluoride (PVDF) thin film sensor of MEMS.In the embodiment that uses strainmeter, strainmeter often is placed on the point of the suspension module that stands high adaptability to changes.
Fig. 4 provides the block diagram of the servo-control system with feedforward controller, and this servo-control system has been utilized suspension sensor of the present invention.In Fig. 4, servo-control system is described with the signal found in the control system and the gain between these signals.Like this, shown module just provides a gain, and the one-component of a signal or signal is then represented in the path of these intermodules.
In Fig. 4, the deviation induction pressure 412 on the suspension module is as the input signal of two transport functions 414 and 410.Transport function 414 (G
WS) relation between expression deviation disturbance 412 and the position error signal 400 that produces by write head.Gain 410 (G
D) relation between expression deviation disturbance 412 and the sensor signal that produces by the suspension sensor.In general, each of these transport functions all is related to the energy input that a sensing element records at outgoing position.Especially, transport function reflects when suspension module is encouraged by the deviation disturbance by moving that its mode of resonance causes.
Sensor signal and position error signal also are subjected to suspension module owing to be applied to the influence of moving that the control signal on the various actuators 407 causes in the driver.Relation between sensor signal and the control signal 407 is shown as gain 416 (G
Fb), and the component 404 of position error signal 400 and the relation between the control signal 407 are shown as gain 408 (G
p).
Will be further described below, by transport function 414 and 416 sensor signals 418 that produce, this signal passes through a summing junction 420, and provides as the input of suspension sensing wave filter 422.Suspension sensing wave filter 422 uses transducing signal 418 to produce the control component 424 that forms control signal 407 parts.Suspension sensing wave filter 422 is set, thereby control component 424 can be eliminated the magnetic head of the deviation induction of position error signal components 406 expressions that produced by gain 410 as much as possible and moves.Control component 424 is controlled component 426 with the PES that is produced according to position error signal 400 by PES control filters 428 and is combined, and this position error signal 400 forms by the combination of position error signal component 406 and position error signal component 404. Control component 424 and 426 has formed control signal 407 jointly.
Fig. 5 provides the simplified block diagram of Fig. 4 feedforward controller operation.In Fig. 5, with sensor signal 418 be described as the suspending input X of sensing wave filter 422, suspension sensor 422 has transfer function H and transport function 490, G
D+WS, transport function 490 wherein is the transport function 414 of Fig. 4 and 410 combination.Transport function G
D+WSRelation between expression sensor signal 418 and the position error signal component 406 in Fig. 5, is described as position signalling d with this position error signal component 406.
Suspension sensing wave filter 422 produces control signal 424, these control signal 424 driving arrangements 408.Equipment 408 has transport function G
PAnd produce position error signal component 404, in Fig. 5, this position error signal component 404 is described to signal y.
In feedforward compensation, adjust the transport function of suspension sensing wave filter, so that poor (in Fig. 5, this difference is described is error signal e) between position signalling d and the position signalling y is reduced to minimum.According to formula, desirable feedforward control system can attempt reaching a result:
E (n)=d (n)-y (n)=0 formula 1 or according to the transport function of the z of input signal x conversion and Fig. 5:
E (z)=0=G
D(z) X (z)-H (z) G
P(z) X (z) formula 2
Like this, if will be arranged to equate that with transport function between sensor signal and write head gained move then feedforward control just can be eliminated random noise very effectively by the combined transfer function that suspension sensing wave filter 422 and equipment 408 provide.
The ability that suspension sensing wave filter 422 is eliminated position error signal components 406 is subjected to placing restrictions on of coherence's degree between sensor signal 418 (x) and the position signalling 406 (d).But this coherence's arithmetic face of land is shown:
In formula 3 formulas, ω represents frequency, and C (ω) is the coherence, S
Dx(ω) be compound intersection power spectrum, that is, and the fourier transform of cross correlation function:
r
Dx(k)=and E[d (n) x (n-k)] formula 4 and S
Dd(ω) and S
Xx(ω) be the frequency spectrum of the autopower of d (n) and x (n) respectively.
The coherence of formula 3 can change between 0 and 1, and 1 expression is strong relevant, and 0 expression is not relevant.
Thereby the performance of suspension sensing wave filter 422 is subjected to placing restrictions on of coherence between sensor signal 418 and the position error signal 406.Especially, the elimination that is provided by suspension sensing wave filter 422 can farthest reduce the resonance of position error signal upper deviation induction to value S
EeInfluence (ω).Value S
Ee(ω) by following formula definition:
S
Ee(ω)=[1-C (ω)] S
Dd(ω) S in formula 5 formulas
Ee(ω) be the frequency spectrum designation of error signal e (n).
In one embodiment, can be estimated as the function of frequency by various gains 414,410,416,408 and 428, and indicate the various modes of resonance of suspension module, the parameter of suspension sensing wave filter 422 is set servo-drive system.The parameter of using gain and resonance frequency to come selective filter then, this parameter can be eliminated the position error signal component 406 of resonant inducing best.
In other embodiments, adaptor parts 440 shown in Figure 4 is used to train the filter parameter of suspension sensing wave filter 422.In one embodiment, adaptor parts 440 comprises lowest mean square (LMS) gradient approximate algorithm 442.The position error signal 444 of LMS algorithm receiving position error signal 400 and estimation, the estimation 466 through the error signal gain 408 that controls to the position produces the position error signal 444 of this estimation from the sensor signal of suspension sensor by making.
Also can use other Matching Algorithm within the scope of the invention.For example, recursive least square (RLS), network and fuzzy logic controller all can be used for the matched filter 422 in the present invention.
In certain embodiments of the present invention, provide a stable feedback unit 450, be subjected in order to prevent feedback transfer function 416 that servo-drive system is unsettled to be influenced.Especially, because control signal 407 influence is by the sensor signal of transport function 416, and this sensor signal is fed to suspension sensing wave filter 422 to form control signal 407, can make the unsettled loop of servo-drive system so formed one.In order to prevent this influence, stablize estimation 452 and delay cell 454 that feedback unit 450 has used transport function 416.The transport function 452 and the delay cell 454 of estimation provide an erasure signal jointly, and this erasure signal is designed to eliminate the influence of control signal to sensor signal 418.Be added on the sensor signal 418 at summing junction 420 places by the erasure signal of stablizing feedback unit 450 and providing.
In other embodiments, the suspension sensor is as the part of twin-stage feedback control loop (for example feedback control loop 500 of Fig. 6).In servo loop 500, reference signal 502 combines with position signalling 504, produces a position error signal 506.Position error signal 506 offers controller 508, and the latter produces a PES control signal 510 according to this position error signal.
In one embodiment, controller 514 is programmed, to produce a sensor control signal, this control signal can be eliminated the resonating movement 526 of sensor 520.Thereby, by sensor control signal 512, scalable control signal 516, thus have only PES control signal 510 just can cause moving of sensor 520.
In the two-stage servo loop 500 of Fig. 6, the frequency of operation of the inner servo loop that is formed by sensor 520 and sensor control unit 514 is higher than the frequency of operation of the outer servo loop that utilizes position signalling 504 and position error signal control 508.This can eliminate the vibration of the outer deviation induction resonance of position error signal feedback control loop bandwidth.
The influence of the inner feedback loop of Fig. 6 has been shown in Fig. 7 and Fig. 8.Fig. 7 and Fig. 8 provide control signal 510 to the amplitude of the transport function of head position 530 and the curve map of phase place respectively.In Fig. 7, along transverse axis 700 frequency is shown, and shows the amplitude of transport function along Z-axis 702, represent with decibel.In Fig. 8, along transverse axis 800 frequency is shown, and phase place is shown along Z-axis 802.
Fig. 7 comprises two vertically hung scrolls of transport function write music line 704 and 706, and Fig. 8 comprises two phase curves 804 and 806 of transport function.When curve 704 and 804 shows the inner servo loop un-activation, the amplitude and the phase place of transport function in the band frequency scope.As can seeing from curve 704, amplitude comprises corresponding to two peak values 708 of suspension mode of resonance and 710.
The amplitude and the phase place of transport function when curve 706 and 806 shows the inner servo loop activation.As shown in Figure 7, along with the activation of inner servo loop, peak value 708 and 710 have been removed.As seeing among Fig. 8, the phase place that inner servo loop has also been removed in the phase curve is anti-phase.Anti-phase by eliminating this phase place, inner servo loop can make outer servo loop work in wideer bandwidth.
Generally speaking, provide the method that the minimizing offtrack moves in the memory storage 100.This method comprises that the sensor of using on the suspension module 200 that is positioned at memory storage 100 301 detects mobile.According to detected mobile generation sensor signal 418.Reduce moving of offtrack with sensor signal 418 then.
In other embodiments, provide a kind of method of in memory storage 100, preventing mode of resonance.This method comprises with 301 detections of the sensor on the suspension module 200 that is positioned at memory storage 100 mobile.According to detected mobile generation sensor signal 518.Then, prevent at least a mode of resonance with sensor signal 518.
The present invention also is provided for reading in from storage medium 106 data storage device 100 of data.This data storage device comprises magnetic head 110 and supports the suspension module 200 of magnetic head 110.At least one actuator comes moving head by mobile at least a portion suspension module 200 in the actuator 118,320,322.The sensor 301 that is installed on the suspension module produces the sensor signal 418 and 518 that expression suspension module 200 moves. Sensor signal 418 and 518 offers servo circuit, and this servo circuit partly is at least one control signal 407 of actuator generation and 516 according to sensor signal 418 and 518.
Should be understood that, though set forth the numerous characteristics and the advantage of various embodiments of the invention in the description formerly, and describe the 26S Proteasome Structure and Function of various embodiments of the invention together in detail, but these disclosures are descriptive, can aspect details, make amendment, aspect the special modular construction and arrangement in the principle of the invention, it can be modified to the gamut that the general general reference implication by the clause that shows in the accessory claim shows.For example, can change these special elements according to the special applications of suspension sensor and servo-drive system, keep essentially identical function simultaneously and do not depart from the scope of the present invention and spirit.In addition, though the preferred embodiment of Miao Shuing is meant the servo-drive system that is used for disk drive system here, but those personnel that are skilled in technique should be appreciated that teaching of the present invention and can be applied to other system under the prerequisite that does not depart from the scope of the present invention with spirit, as magnetic tape drive or optical drive system.
Claims (11)
1. one kind is reduced the method that offtrack moves, and it is characterized in that, described method comprises step:
(a) detect mobile with the sensor on the suspension module that is positioned at memory storage;
(b) according to the mobile generation sensor signal that is detected; And
(c) reduce moving of offtrack with described sensor signal.
2. method according to claim 1 is characterized in that, uses described step (c) to comprise:
(c) (1) applies sensor signal to produce a sensor control signal to feedforward filter; And
(c) (2) apply sensor control signal to locate described magnetic head to one or more actuators.
3. method according to claim 2 is characterized in that, the step that applies sensor signal to feedforward filter comprises, described sensor signal is imposed on by control system make the improved feedforward filter of coupling.
4. method according to claim 2 is characterized in that, uses step (c) also to comprise described sensor control signal is imposed on feedback control loop, to reduce the influence of sensor control signal to sensor signal
5. a method of preventing mode of resonance in memory storage is characterized in that, described method comprises step:
(a) detect mobile with the sensor that is positioned on the memory storage suspension module;
(b) according to the mobile generation sensor signal that is detected; And
(c) prevent at least a mode of resonance with described sensor signal.
6. method according to claim 5 is characterized in that, uses step (c) to comprise:
(c) (1) imposes on feedback controller with described sensor signal, to produce feedback control signal; And
(c) (2) impose on one or more actuators with described feedback control signal, to locate described magnetic head.
7. one kind is used for it is characterized in that from the data storage device of storage medium reading of data described data storage device comprises:
A magnetic head is used for from described storage medium reading of data;
One suspension module is used to support described magnetic head;
At least one actuator moves described magnetic head by the described suspension module of mobile at least a portion;
A sensor that is installed on the described suspension module is used to produce the sensor signal that the described suspension module of expression moves; And
Servo circuit according to the described sensor signal of small part, is control signal of at least one actuator generation.
8. data storage device according to claim 7 is characterized in that described servo circuit comprises feedforward filter, and described feedforward filter produces the sensor component of described control signal according to described sensor signal.
9. data storage device according to claim 8 is characterized in that, described servo circuit also comprises an adaptation element, the parameter that is used to regulate described feedforward filter.
10. data storage device according to claim 8 is characterized in that described servo circuit also comprises stable feedback unit, is used to reduce the influence of described control signal to described transducing signal.
11. data storage device according to claim 7 is characterized in that, described servo circuit also comprises sensor feedback control, is used for producing a feedback control signal according to described sensor signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US23997200P | 2000-10-13 | 2000-10-13 | |
| US60/239,972 | 2000-10-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1470056A true CN1470056A (en) | 2004-01-21 |
Family
ID=22904542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA018171648A Pending CN1470056A (en) | 2000-10-13 | 2001-09-04 | Suspension sense capability for windage control |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US6771454B2 (en) |
| CN (1) | CN1470056A (en) |
| WO (1) | WO2002031827A2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110246522A (en) * | 2018-03-08 | 2019-09-17 | 株式会社东芝 | Disk set |
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| KR20020013976A (en) * | 1999-07-23 | 2002-02-21 | 추후 | Disturbance rejection for disc drives using adaptive accelerometer feedforward servo |
| US6977790B1 (en) * | 2001-05-04 | 2005-12-20 | Maxtor Corporation | Design scheme to increase the gain of strain based sensors in hard disk drive actuators |
| AU2003237839A1 (en) * | 2002-05-13 | 2003-11-11 | University Of Florida | Resonant energy mems array and system including dynamically modifiable power processor |
| US20030231432A1 (en) * | 2002-06-18 | 2003-12-18 | Seagate Technology Llc | Windage, shock and low mass conventional suspension design |
| US7268970B2 (en) * | 2003-11-20 | 2007-09-11 | Hewlett-Packard Development Company, L.P. | Method and apparatus for storing data on magnetic tape |
| US7292407B2 (en) * | 2004-09-30 | 2007-11-06 | Hitachi Global Storage Technologies Netherlands B.V. | Disk drive with support structure for disk-vibration capacitive sensors |
| US7379259B2 (en) * | 2005-09-12 | 2008-05-27 | Certance Llc | Head actuator design for a low profile tape drive |
| US7782003B2 (en) * | 2005-11-03 | 2010-08-24 | Seagate Technology Llc | Positional indicia misplacement compensation |
| US7813083B2 (en) * | 2006-01-18 | 2010-10-12 | Maxtor Corporation | Disk drive load arm structure having a strain sensor and method of its fabrication |
| US8179629B2 (en) | 2007-12-26 | 2012-05-15 | Nitto Denko Corporation | Flexure based shock and vibration sensor for head suspensions in hard disk drives |
| JP2009289345A (en) * | 2008-05-29 | 2009-12-10 | Fujitsu Ltd | Flying height control method, circuit, and information recording device |
| JP2019160357A (en) | 2018-03-08 | 2019-09-19 | 株式会社東芝 | Magnetic disk device |
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-
2001
- 2001-09-04 WO PCT/US2001/041990 patent/WO2002031827A2/en active Application Filing
- 2001-09-04 CN CNA018171648A patent/CN1470056A/en active Pending
- 2001-09-04 US US09/945,940 patent/US6771454B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110246522A (en) * | 2018-03-08 | 2019-09-17 | 株式会社东芝 | Disk set |
| CN110246522B (en) * | 2018-03-08 | 2021-02-02 | 株式会社东芝 | Magnetic disk device |
Also Published As
| Publication number | Publication date |
|---|---|
| US20020063989A1 (en) | 2002-05-30 |
| WO2002031827A2 (en) | 2002-04-18 |
| US6771454B2 (en) | 2004-08-03 |
| WO2002031827A3 (en) | 2002-07-04 |
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